Feature

Photographs Aid Doctors

Nature Ramblings: Ready for Spring

Flame Throwing Tank Hurls Blazing Oil in Chunks

Army Alert for Influenza

First Hybrid Gibbon Born at Washington Zoo

Front Matter

Jet Propelled Planes

Oxygen Lack Prevented

New Camera Device for Aerial Photos

Speed of Bullet Clocked

Navy Is Now Using Jet Propulsion Takeoffs

The Polio Epidemic Is Dying out Slowly